JP2000108846A - Webbing winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a webbing winder, wherein no damaging occurs even if a winding torque difference between a large spring and a small spring is set large. SOLUTION: The fixing section of the disk portion of a spring sheet 36 is provided with a fixing block 46 and a swinging block 48. One end of a small spring 34 is engaged with the engaging part 50 of the fixing block 46. The swinging block 48 is swung around a spindle 70, and pressed toward the diameter direction outer side of the spring sheet 36 by a leaf spring 74 housed in a housing part 54. When the small spring 34 is fully sealed, the leaf spring 74 is elastically deformed by the small spring 34, and since a part of the winding torque of the large spring 64 is absorbed by the elastic deformation, no damage occurs in a webbing winder 12 even if an elastic force (winding torque) difference between the large spring 64 and the small spring 34 is set large.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a webbing winding device.

[0002]

2. Description of the Related Art FIGS. 13 to 15 partially show a conventional webbing winding device 102. FIG.

In this webbing take-up device 102, a spiral small spring 11 is attached to an adapter 108 which rotates integrally with a spool 106 for taking up the webbing 104.
0 is fixed at the inner end. Small spring 110
The inner end of a spiral large spring 114 having a greater elasticity than the small spring 110 is fixed to the spring seat 112 to which the outer end of the spring is fixed. Small spring 110 and large spring 114
Urge the spool 106 to rotate in the webbing winding direction.

Further, ratchet teeth 116 are formed on the outer periphery of the spring seat 112 so that the webbing 11 is formed.
When the tongue plate provided at 4 is inserted into a buckle (both not shown) and locked, the solenoid 11
8, the pawl 120 is engaged with the ratchet teeth 116, and the rotation of the spring seat 112 in the webbing winding direction (the direction of arrow A) is prevented.

[0005] The webbing take-up device 10 having such a configuration.
2, when the webbing 104 is pulled out, the webbing pulling force acts on the small spring 110 so that the small spring 110 is wound inward by a predetermined length, and this pulling force is transmitted to the large spring 114 via the spring seat 112. The large spring 114 is also tightened by a predetermined length. here,
When the tongue plate is inserted into the buckle and locked,
Since the pawl 120 is engaged with the ratchet teeth 116 and the rotation of the spring seat 112 in the webbing winding direction is prevented, the elastic force of the large spring 114 does not act on the spool, and only the small elastic force of the small spring 110 is applied. Acting on the spool, the feeling of pressure on the webbing wearer is reduced.

However, if the tongue plate is removed from the buckle in this state, the pawl 120 is separated from the ratchet teeth 116 and the spring seat 112 is rotatable in the webbing winding direction. Due to the large elastic force of the large spring 114, the spring seat 112 rapidly rotates in the webbing winding direction. Then, due to this elastic force, as shown in FIG. 15, the small spring 110 is brought into a state of full contact in a short time.

As described above, the elastic energy of the large spring 114 is released at a stretch in a short time, and the small spring 110 is brought into full contact with the impact, so that the small spring 110 itself and the small spring 110
A large impact force acts on a portion fixed to the spring seat 112 and the adapter 108 (particularly, a portion fixed to the adapter 108). Therefore, the small spring 110 itself, or the small spring 110 and the spring seat 1
In order to prevent breakage of the fixed portion between the large spring 12 and the adapter 108, the difference between the elastic force of the large spring 114 and the elastic force of the small spring 110 (difference in winding torque) must be set small.

[0008]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a webbing take-up device which will not be damaged even if the difference in the take-up torque between the large spring and the small spring is set large. .

[0009]

According to the first aspect of the present invention, there is provided a spool capable of winding a webbing, and an inner end fixed to the spool to rotationally urge the spool in a webbing winding direction by elastic recovery. (1) a spiral spring, a rotating body having an outer end fixed to the first spiral spring and rotatable coaxially with the spool, and a webbing winding direction larger than the first spiral spring having an inner end fixed to the rotating body. A second spiral spring for transmitting elastic force to the spool via the rotating body and the first spiral spring, and engaging with the rotating body when it is detected that the webbing is mounted on the occupant. A pawl for preventing rotation in the take-off direction, and a pawl arranged in contact with the inside of the first spiral spring, wherein the pawl is disengaged from the rotating body and the elastic force of the second spiral spring causes the first spiral spring to rotate. Is tightened Pushed one spiral spring is elastically deformed,
An elastic member for applying a resistance to the tightening of the first spiral spring.

When the pawl is not engaged with the rotating body, the rotating body is not prevented from rotating in the webbing pull-out direction. Then, the webbing can be pulled out and taken up by rotating the spool in the direction of the elastic force (rotary urging force) of the first spiral spring and in the opposite direction.

When the webbing is pulled out and the spool is rotated in a direction opposite to the elastic force of the first spiral spring, the first spiral spring is wound inward, and a certain elastic energy is accumulated in the first spiral spring. Also, the second through the rotating body
The spiral spring is also wound inward by a predetermined amount, and a certain elastic energy is stored. At this time, when it is detected that the webbing is mounted on the occupant by inserting the tongue plate into the buckle and engaging the buckle, the pawl is engaged with the rotating body, and the rotation of the rotating body in the webbing winding direction is stopped. Block. Accordingly, only the elastic force of the first spiral spring acts on the spool, and the feeling of pressure on the webbing wearer is reduced.

Here, when the engagement of the pawl with the rotating body is released, the large elastic force of the second spiral spring acts on the rotating body, and the rotating body rotates. Further, the elastic force acts on the first spiral spring via the rotating body, and the first spiral spring is tightened. As a result, the elastic member is pressed by the first spiral spring and is elastically deformed, and the elastic reaction force exerts a resisting force on the tightening of the first spiral spring.

As described above, a part of the elastic force of the second spiral spring is absorbed as a force for elastically deforming the elastic member, and the first spiral spring does not come into a so-called full contact state by impact. Even if the difference between the elastic force of the two spiral springs and the elastic force of the first spiral spring is set to be large, a part of the webbing winding device will not be damaged.

According to a second aspect of the present invention, in the first aspect of the present invention, the elastic member applies the resistance force radially outward of the first spiral spring.

Therefore, the direction of deformation or movement of the elastic member is also in the radial direction of the first spiral spring. As a result, the direction in which the first spiral spring comes into full contact (inward in the radial direction) is opposite to the direction of the resistance force from the elastic member (in the radial direction), and this resistance force is applied to the first spiral spring. Works effectively.

According to a third aspect of the present invention, in the first aspect of the present invention, the elastic member applies the resistance force in a circumferential direction of the first spiral spring.

Therefore, the direction of deformation or movement of the elastic member is also the circumferential direction of the first spiral spring. This eliminates the need to provide a space for the elastic member to be deformed or moved radially outward of the first spiral spring, thereby making it possible to reduce the size of the webbing retractor.

[0018]

1 to 4 partially show a webbing take-up device 12 according to a first embodiment of the present invention.

As shown in FIG. 1, the webbing take-up device 12 has a cylindrical spool 16 on which a webbing 14 is wound. The spool 16 is attached to a frame 15 (see FIG. 4, not shown in FIGS. 1 to 3) so as to be rotatable around the axis J. The webbing 14 is wound up and pulled out by rotating the spool 16. .

A casing 18 is fixed to the frame 15. A flange 20 is provided around the casing 18.
And the inside of the flange 20 is a storage portion.

As shown in FIG. 4, the casing 18 has a cylindrical flange 20 inside (in the center of the accommodation portion).
An insertion hole 22 is formed. A substantially cylindrical adapter 24 is rotatably inserted into the insertion hole 22. An enlarged diameter portion 26 swelling radially outward is formed substantially at the center of the adapter 24 in the longitudinal direction, and the enlarged diameter portion 26 hits the casing 18 to position the adapter 24 in the longitudinal direction.

A shaft 28 projecting from the spool 16 is inserted and fixed to one end of the adapter 24 (the shaft 28 is not shown in FIG. 4). This allows
The spool 16 and the adapter 24 rotate integrally.

The other end of the adapter 24 is reduced in diameter in the radial direction, and has a small diameter portion 30 and a large diameter portion 32 from the other end. The inner end of a spiral small spring 34 is fixed to the large diameter portion 32. As also shown in FIGS. 2 and 3,
The outer end of the small spring 34 is the spring seat 3
6 is fixed to the fixing portion 38 formed in the fixing member 6. The small spring 34 is wound in a predetermined direction so as to urge the spool 16 to rotate in the webbing winding direction (direction of arrow A) via the adapter 24 by elastic force.

The spring seat 36 has a disk portion 40 coaxial with the axis J, a substantially flat cylindrical large-diameter cylindrical portion 42 extending from the vicinity of the outer periphery of the disk portion 40 toward the adapter 24, and And a small-diameter cylindrical portion 43 extending from the radially inner side of the disk portion 40 to the opposite side from the large-diameter cylindrical portion 42. As shown in FIG. 4, the small spring 34 is housed inside the large-diameter cylindrical portion 42. In addition, the large-diameter cylindrical portion 4
2 is formed on the inner surface side of FIG.
reference).

As shown in detail in FIG.
A fixed block 46 having an approximately elliptical end face standing from the disk portion 40, and a swing block 48 disposed adjacent to the fixed block 46 on the side of the webbing withdrawal direction (direction of arrow B) of the fixed block 46; , It consists of. An engaging portion 50 is formed inside the fixed block 46 (on the side of the axis J), and one end of the small spring 34 is engaged with the engaging portion 50.

The swing block 48 has a shaft support hole 5 near one end.
2 and a substantially fan-shaped spring accommodating portion 54 is formed on the webbing withdrawing direction side of the shaft support hole 52. In the shaft support hole 52, a support shaft 7 erected from the disk portion 40 is provided.
0 is inserted, and the swing block 48 can swing around the support shaft 70.

A substantially flat holding plate 72 erected from the disk portion 40 is housed in the spring housing portion 54.
Between the holding plate 72 and the spring accommodating portion 54, a leaf spring 74 formed by bending a single metal plate material at an approximate center in the longitudinal direction at an acute angle is provided. The leaf spring 74 urges the swing block 48 radially outward of the spring seat 36 (in a direction away from the axis J).

As shown in FIG. 3, the small spring 3
The outer end of the swing block 4 is engaged with the engaging portion 50, is wound around the fixed block 46 once or more times toward the inner end, and is in contact with the outer surface 48 </ b> A of the swing block 48. In the normal state, the swing block 48 is at a position radially outside the spring seat 36 by the elastic force of the leaf spring 74 (against the elastic force of the small spring 34), but as shown in FIG. If the force is applied to the swing block 48 in the direction toward the axis J by a predetermined value or more, the leaf spring 74
The swing block 48 swings toward the axis J against the elastic force of.

Ratchet teeth 56 are formed on the outer periphery of the large-diameter cylindrical portion 42 of the spring seat 36. on the other hand,
A pawl 60, which is rotated by a solenoid 58 and can engage with the ratchet teeth 56, is supported on a cover 66 described later. The pawl 60 is urged by a spring 62 in a direction away from the ratchet teeth 56. When the pawl 60 is engaged, the ratchet teeth 56 prevent rotation of the spring seat 36 in the webbing take-up direction (arrow A direction), but do not prevent rotation of the spring seat 36 in the webbing pull-out direction (arrow B direction). And is formed to be inclined in a predetermined direction.

The solenoid 58 is connected to the webbing take-up device 1
2 is electrically connected to the buckle (not shown),
When a tank plate (not shown) is inserted into the buckle, the solenoid 58 is energized. Therefore, when the tongue plate is inserted into the buckle, the solenoid is energized, and the pawl 60 rotates against the urging force of the spring 62 and engages with the ratchet teeth 56, so that the webbing winding direction of the spring seat 36 ( (Arrow A direction)
Is prevented from rotating. When the tongue plate is pulled out of the buckle, the solenoid 58 is de-energized, and the pawl 60 is rotated by the biasing force of the spring 62 to be separated from the ratchet teeth 56. In either direction.

The inner end of a spiral large spring 64 is fixed to the flat cylindrical small-diameter cylindrical portion 43 erected from the spring seat 36. Large spring 64
Is formed to be wider with a higher rigidity metal so as to have a higher elastic constant than the small spring 34.

The outer end of the large spring 64 is
6 is fixed to a fixing portion 68 formed in the fixing member 6. The winding direction of the large spring 64 is determined by the spring seat 3
6 is a direction for urging the webbing 6 to rotate in the webbing winding direction.

The cover 66 is provided with a predetermined attachment portion, and the attachment portion allows the cover 66 to be attached to the casing 1.
8 attached. In the mounted state, the small spring 34, the spring seat 36, the large spring 64, the pawl 60, the spring 62, and the solenoid 58 are housed between the casing 18 and the cover 66, and the cover 6
6 covered.

Next, the operation of the webbing take-up device 12 according to the present embodiment will be described.

When the webbing 14 (see FIG. 1) is not mounted on the occupant, the tongue plate is not inserted into the buckle, so that as shown in FIG.
8 is not energized and pawl 60 has ratchet teeth 56
The spring seat 36 is rotatable in both the webbing winding direction (arrow A direction) and the webbing pull-out direction (arrow B direction).

Here, when the webbing 14 is pulled out, the spool 16 (see FIG. 1) and the adapter 24 rotate in the webbing pulling-out direction due to the pulling-out force. By this rotation, as shown in FIG. 5, the inner end of the small spring 34 rotates in the webbing withdrawing direction (the direction of arrow B), and the small spring 34 is wound inside. Further, since the outer end of the small spring 34 also rotates in the webbing pull-out direction, a part of the webbing pull-out force acts on the inner end of the large spring 64 via the spring seat 36. Therefore, the large spring 64 is also wound inside. As a result, the spool 16 is urged in the webbing winding direction (the direction of arrow A) by the elastic force of the small spring 34 and the large spring 64, so that the webbing 14 is attached to the spool 16 simply by releasing the occupant from the webbing 14. It is wound with a predetermined winding force.

When the webbing 14 pulled out by a predetermined length is mounted on the occupant and the tongue plate is inserted into the buckle, as shown in FIG. 6, the solenoid 58 is energized to rotate the pawl 60, and the ratchet teeth And 56 are engaged. Since the rotation of the spring seat 36 in the webbing winding direction (the direction of the arrow A) is prevented, the large spring 64 is maintained in a state of being tightened by a predetermined length. Since the urging force of the large spring 64 does not act on the spool 16 via the spring seat 36 and the small spring 34, the small spring 3
Only the urging force of 4 acts. For this reason, the load from the webbing to the webbing wearer is reduced, and the feeling of pressure on the webbing wearer is reduced.

When the occupant pulls out the webbing 14 in this state, the small spring 34 is further tightened inward. FIG. 6 shows the small spring 34 in a state of being wound inside as described above.

When the tongue plate is extracted from the buckle, the solenoid 58 is de-energized, and the pawl 60 is rotated by the urging force of the spring 62 to separate from the ratchet teeth 56 as shown in FIG. This allows the spring seat 36 to rotate in the webbing winding direction (the direction of arrow A). Since the large spring 64 is wound inside by a predetermined amount and a large amount of elastic energy is accumulated,
Due to this elastic energy, the spring seat 36 rotates at a large angular velocity in the webbing winding direction (the direction of arrow A). Due to the rotation of the spring seat 36, the small spring 34 is wound inward and is brought into a so-called fully adhered state.

At this time, as can be seen from FIG. 7, when the portion near the outer end of the small spring 34 moves toward the front axis J, the swing block 48 around which the small spring 34 is wound becomes a leaf spring. 74 is elastically deformed, and swings toward the axis J against the urging force.
Due to the elastic deformation of the leaf spring 74, the large spring 6
Part of the elastic force acting from 4 is absorbed, and the impact when the small springs 34 are brought into the fully adhered state is reduced. In particular, in the webbing take-up device according to the first embodiment, the direction of the urging force of the leaf spring 74 is directed radially outward of the small spring 34, and the small spring 3
Since the direction 4 is opposite to the direction of full contact (inward in the radial direction), the urging force of the leaf spring 74 effectively acts on the small spring 34 as a resistance to the complete contact.

As shown in FIG. 8, when the large spring 64 is in the natural state, the spring seat 3
Since the rotation of the webbing 6 in the webbing winding direction is stopped, the small spring 34 is elastically restored to the natural state.

As described above, in the webbing take-up device 12 according to the present embodiment, the pawl 60 is separated from the ratchet teeth 56, the spring seat 36 rotates in the webbing take-up direction, and the small spring 34 is brought into a completely adhered state. At this time, a part of the elastic force (rotational driving force) of the large spring 64 is absorbed as a force for elastically deforming the leaf spring 74. For this reason, even if the difference between the elastic force of the large spring 64 and the elastic force of the small spring 34 is set large,
The small spring 34 does not come into full contact with the impact. Accordingly, the small spring 34 and the fixed portions of the small spring 34, the adapter 24, and the spring seat 36 are not damaged by the impact when the state of full contact is reached.

Further, as compared with the conventional webbing take-up device, the support shaft 70, the holding plate 72 and the plate spring 74 are arranged on the spring seat 36 and the swing block 48 is simply swung, so that the structure is complicated. And the webbing take-up device 12 does not become large.

FIGS. 10 and 11 partially show a webbing take-up device according to a second embodiment of the present invention. In the webbing retractor according to the second embodiment, only the configuration of the fixing portion 38 is different from that of the webbing retractor 12 according to the first embodiment.
Only the fixing portion 38 will be described, and the description of the other portions will be omitted.

That is, in the webbing take-up device of the second embodiment, a fixed block 76 having substantially the same shape as the swing block 48 of the first embodiment is attached to the spring seat 36.
And is fixed without swinging.

The fixed block 46 is partially divided on the webbing winding direction side to form a fixed portion 46A and a moving portion 46B. A coil spring 78 is provided between the fixed part 46A and the moving part 46B, and urges the moving part 46B in a direction away from the fixed part 46A. As in the first embodiment, the outer end portion of the small spring 34 is wound around the fixed block 46 once or a plurality of times.
4, the movement of the moving part 46B (movement in the direction away from the fixed part 46A) is limited to a predetermined range.

In the webbing take-up device of the second embodiment, when the spring seat 36 is rotated at a large angular velocity in the webbing take-up direction (the direction of arrow A), and the small spring 34 is brought into a fully adhered state, as shown in FIG. As can be seen from the figure, the portion near the outer end of the small spring 34 (the portion wound around the fixed block 46) is also tightened,
The moving portion 46B is moved in a direction approaching the fixed portion 46A against the elastic force of the coil spring 78. This coil spring 7
Due to the elastic deformation of 8, a part of the elastic force acting from the large spring 64 is absorbed, and the impact when the small spring 34 is brought into the fully adhered state is reduced.

Therefore, in the webbing take-up device of the second embodiment, even if the difference between the elastic force of the large spring 64 and the elastic force of the small spring 34 is set to be large, the small spring 34 is kept in the fully adhered state. It will not be damaged by the shock when it becomes. In particular, in the webbing take-up device of the second embodiment, the direction of the urging force of the coil spring 78 is oriented in the circumferential direction of the small spring 34, and the coil spring 78 is deformed or the moving part 46B moves. Small spring 3
It is not necessary to provide a position on the outside in the radial direction of No. 4. Therefore, the size of the spring seat 36 can be reduced, and further, the size of the webbing retractor itself can be reduced.

In the above description, when the small spring 34 is wound inward by elastic deformation and comes into full contact with each other, a leaf spring is used as an elastic member for exerting a resistance force to this elastic deformation (tightening). Although the 74 and the coil spring 78 have been described as examples, the elastic members are not limited to these. For example, a block-shaped rubber around which a part (near the outer end or the like) of the small spring 34 is wound may be fixed to the disk portion 40 of the spring seat 36. In this case, when the small spring 34 is wrapped inward by elastic deformation and is brought into a fully adhered state, the rubber is elastically deformed and the small spring 34 acts on the deformation to act from the large spring ring 64. Absorbs part of the driving force.

[0050]

According to the first aspect of the present invention, there is provided a spool capable of winding the webbing, and a first spiral spring having an inner end fixed to the spool and elastically restoring the spool to rotate in the webbing winding direction. A rotating body having an outer end fixed to the spool and rotatable coaxially with the spool; and an inner end fixed to the rotating body and having a greater elastic force in a webbing winding direction than the first spiral spring. A second spiral spring transmitting the rotation to the spool via a rotating body and a first spiral spring;
A pawl that is engaged with the rotating body to prevent rotation in the webbing take-up direction when it is detected that the webbing is mounted on an occupant; and a pawl arranged in contact with the inside of the first spiral spring, Releases the engagement with the rotating body and
When the first spiral spring is tightened by the elastic force of the spiral spring, the first spiral spring is pressed and elastically deformed by the first spiral spring, and has an elastic member which exerts a resistance force on the tightening of the first spiral spring. Even if the difference between the elastic force of the spiral spring and the elastic force of the first spiral spring is set to be large, a part of the webbing winding device will not be damaged.

According to the second aspect of the present invention, in the first aspect of the present invention, the elastic member applies the resisting force radially outward of the first spiral spring.
This resistance effectively acts on the first spiral spring.

According to a third aspect of the present invention, in the first aspect of the present invention, the elastic member exerts the resistance force in a circumferential direction of the first spiral spring. It is possible to reduce the size.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view partially showing a webbing take-up device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view partially showing the webbing take-up device according to the first embodiment of the present invention.

FIG. 3 is a partially cutaway front view of the webbing take-up device according to the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view partially showing the webbing take-up device according to the first embodiment of the present invention.

FIG. 5 is a front view showing an operation state of the webbing take-up device according to the first embodiment of the present invention, partially cut away;

FIG. 6 is a partially cutaway front view showing an operation state of the webbing take-up device according to the first embodiment of the present invention.

FIG. 7 is a partially cutaway front view showing an operation state of the webbing take-up device according to the first embodiment of the present invention.

FIG. 8 is a partially cutaway front view showing an operation state of the webbing take-up device according to the first embodiment of the present invention.

FIG. 9 is an exploded perspective view showing, in an enlarged manner, the vicinity of a fixing portion of the webbing take-up device according to the first embodiment of the present invention.

FIG. 10 is a front view partially showing a webbing take-up device according to a second embodiment of the present invention.

FIG. 11 is an exploded perspective view showing, in an enlarged manner, the vicinity of a fixing portion of a webbing take-up device according to a second embodiment of the present invention.

FIG. 12 is a front view partially showing an operation state of a webbing take-up device according to a second embodiment of the present invention.

FIG. 13 is an exploded perspective view partially showing a conventional webbing winding device.

FIG. 14 is a front view showing a conventional webbing take-up device, partially cut away.

FIG. 15 is a front view showing an operation state of the conventional webbing take-up device, partially broken away.

[Explanation of symbols]

 12 Webbing take-up device 16 Spool 34 Small spring (first spiral spring) 36 Spring seat (rotary body) 46B Moving part (elastic member) 48 Swing block (elastic member) 60 Paul (fixing means) 64 Large spring (second spring) Spiral spring) 74 Leaf spring (elastic member) 76 Coil spring (elastic member)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomoki Nagata 3-260 Toyota, Oguchi-machi, Niwa-gun, Aichi Prefecture F-term in Tokai Rika Electric Works, Ltd. 3D018 GA00 LA04

Claims (3)

[Claims] 1. A spool capable of winding webbing, a first spiral spring having an inner end fixed to the spool and elastically restoring the spool in the webbing winding direction, and an outer end of the first spiral spring. A rotating body that is rotatable coaxially with the spool, and an inner end that is secured to the rotating body, and that provides a larger elastic force in the webbing winding direction than the first spiral spring to the rotating body and the first spiral spring. A second spiral spring that transmits to the spool via the spool, and a pawl that engages with the rotating body to prevent rotation in the webbing winding direction when it is detected that the webbing is mounted on an occupant; The pawl is disposed in contact with the inside of the spiral spring, and when the pawl is disengaged from the rotating body and the first spiral spring is tightened by the elastic force of the second spiral spring, the pawl is pushed by the first spiral spring. Elastically deformed, first The webbing retractor and having an elastic member for applying a resistance force to the tightening of the coil spring, the. 2. The webbing take-up device according to claim 1, wherein the elastic member applies the resistance force radially outward of the first spiral spring. 3. The webbing retractor according to claim 1, wherein the elastic member applies the resistance force in a circumferential direction of the first spiral spring.